Naming nodes in similarity program

[JoelGardes]

Most applications name duplicate file name with [filename (n)]

That's occurring a problem in program similarity when computing temporary graph for Voronoï process by the fact that "(" and ")" characters are incompatible (reserved markups) in dot files.

Consequence : similarity program is stopped at Voronoï computing.

Applying the same rules than in final graph building for temporary graphs?